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SEGMENT REPORTING - Summary of Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 198,547 | $ 172,832 | $ 549,670 | $ 485,936 |
Depreciation and amortization | 20,940 | 18,202 | 58,144 | 51,572 |
Operating Income (Loss) | 18,485 | 28,884 | 38,471 | 44,871 |
Total assets | 935,780 |  | 935,780 |  | $ 732,410
Operating |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 198,547 | 172,832 | 549,670 | 485,936 |
Depreciation and amortization | 20,940 | 18,202 | 58,144 | 51,572 |
Operating Income (Loss) | 18,485 | 28,884 | 38,471 | 44,871 |
Total assets | 935,780 | 702,848 | 935,780 | 702,848 |
Operating | Eastern |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 59,675 | 56,006 | 163,748 | 154,099 |
Depreciation and amortization | 6,386 | 7,267 | 18,014 | 20,276 |
Operating Income (Loss) | 2,121 | 15,222 | 5,722 | 17,675 |
Total assets | 209,123 | 180,896 | 209,123 | 180,896 |
Operating | Western |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 92,871 | 74,425 | 251,860 | 210,208 |
Depreciation and amortization | 12,620 | 8,844 | 34,279 | 25,226 |
Operating Income (Loss) | 15,148 | 13,927 | 30,849 | 33,104 |
Total assets | 596,765 | 402,931 | 596,765 | 402,931 |
Operating | Recycling |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 10,726 | 10,877 | 32,006 | 30,634 |
Depreciation and amortization | 1,028 | 1,131 | 2,975 | 3,228 |
Operating Income (Loss) | 145 | (516) | (1,010) | (7,933) |
Total assets | 57,216 | 48,995 | 57,216 | 48,995 |
Operating | Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 35,275 | 31,524 | 102,056 | 90,995 |
Depreciation and amortization | 906 | 960 | 2,876 | 2,842 |
Operating Income (Loss) | 1,071 | 251 | 2,910 | 2,025 |
Total assets | 72,676 | 70,026 | 72,676 | 70,026 |
Inter-company revenues |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | (45,005) | (37,363) | (120,297) | (106,401) |
Inter-company revenues | Eastern |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 15,156 | 14,557 | 40,606 | 40,432 |
Inter-company revenues | Western |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 26,645 | 20,578 | 70,960 | 59,898 |
Inter-company revenues | Recycling |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | 2,486 | 1,773 | 6,820 | 4,697 |
Inter-company revenues | Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenues | $ 718 | $ 455 | $ 1,911 | $ 1,374 |

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